I just put two golite bags up on ebay.
They are really warm, and really light. I found that in my old age, I do better with a slightly heavier zippered bag, but they ought to be be perfect for someone putting weight first.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=190584072874http://www.ebay.com/itm/190584071798?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649